221025060 has 36 divisors (see below), whose sum is σ = 670443228. Its totient is φ = 58939968.

The previous prime is 221025053. The next prime is 221025061. The reversal of 221025060 is 60520122.

It can be written as a sum of positive squares in 2 ways, for example, as 142277184 + 78747876 = 11928^2 + 8874^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221025061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613779 + ... + 614138.

It is an arithmetic number, because the mean of its divisors is an integer number (18623423).

Almost surely, 2^221025060 is an apocalyptic number.

221025060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221025060 is an abundant number, since it is smaller than the sum of its proper divisors (449418168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221025060 is a wasteful number, since it uses less digits than its factorization.

221025060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227932 (or 1227927 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221025060 is about 14866.9115824370. The cubic root of 221025060 is about 604.6172111277.

Adding to 221025060 its reverse (60520122), we get a palindrome (281545182).

The spelling of 221025060 in words is "two hundred twenty-one million, twenty-five thousand, sixty".